Variation of permittivity in radial direction in concentric half-split cylindrical dielectric resonator antenna for wideband application

Abstract

Design and development of wideband concentric half‐split cylindrical dielectric resonator antenna (CDRA) using permittivity variation in radial direction has been proposed in this article. The homogeneous, two‐layer and three‐layer concentric half‐split CDRAs have been discussed separately. The effect of antenna parameters such as layer arrangement, geometrical parameters, and probe length are investigated. To validate the results, two‐layer and three‐layer concentric half‐split CDRA have been fabricated using commercially available microwave laminates. In each case, the input reflection coefficient, radiation pattern, and antenna gain are simulated and measured. Good agreements between simulated and measured results have been obtained. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:321–329, 2015.

A new modified CPW-fed wideband circularly polarized half-split cylindrical dielectric resonator antenna with different permittivity of two layers in radial direction

“…HS-CDRA consists of different permittivity of two layers in radial direction and excited with new modified CPW-fed. This new modified CPW-fed (signal line, rectangular, and slotted patch) are printed on the FR4 substrate [all dimension in mm: r 1 5 11, r 2 5 20, h 5 11.4, hs 5 1.6, L S 5 44, L S1 5 30.5, L S2 5 8.5, L S3 5 5, W S 5 56, W S1 5 48, W S2 5 2.5, W S3 5 2.7, W S4 5 3.3, W S5 5 2, P W1 5 9, P L1 5 12, SP W1 5 11, SP L1 5 13, W t 5 1, W t1 5 3, g 5 1 5 g 1 , g 2 5 1.55, g 3 5 0.95, and L F 5 31.5] (dielectric constant 4.4, loss tangent 0.025) and above of it, as used here, 15 having different permittivity of two layers in radial direction, HS-CDRA is placed. HS-CDRA is made of dielectric materials namely, Roger RT/Duroid 6010 (e r1 5 10.2) and Polyflon Polyguide (e r2 5 2.32) having radius r 1 5 11 mm, r 2 5 20 mm, respectively, with height (h) 5 11.4 mm, shown in Figure 1 (all dimensions are shown in caption of Figure 1).…”

“…The half‐split cylindrical DRA (HS‐CDRA) was introduced in 1989 by Mongia . First time, Chaudhary et al investigated multilayer multipermittivity HS‐CDRA for wideband applications then after same authors developed concentric HS‐CDRA using permittivity variation in radial direction for wideband applications …”

“…13 First time, Chaudhary et al investigated multilayer multipermittivity HS-CDRA for wideband applications 14 then after same authors developed concentric HS-CDRA using permittivity variation in radial direction for wideband applications. 15 The coplanar waveguide (CPW) feed is another option in the place of microstrip feed line. CPW feed shows advantages over microstrip feed line such as ground and feed on same plane, less dispersion, low radiation loss, and provides design flexibility.…”

Wideband circularly polarized dielectric resonator antenna coupled with meandered-line inductor for ISM/WLAN applications

“…Therefore several scientific researches are going to generate circular polarization (CP) using DRA. DRA offers several advantages like wide bandwidth, high radiation efficiency, compact size, low loss, flexible feeding mechanism, and various types shape . In DRA, CP can be achieved by introducing single and dual/complex feeding mechanism .…”

“…DRA offers several advantages like wide bandwidth, high radiation efficiency, compact size, low loss, flexible feeding mechanism, and various types shape. [3][4][5][6] In DRA, CP can be achieved by introducing single and dual/ complex feeding mechanism. 7,8 In recent years, antenna engineers have been more focused on single feeding technique to generate wideband CP in a DRA.…”